Retarded action electric motor control device



S K ,Y a 1 mam W mm TE A 3 & N N 5, .v W 2 m V U AMM m TmT m EL m Mm W Y To EM U H mm B LM L m A wm M OE m G. w mm a V E m m m Jan. 9, 1951 Filed June 29, 1946 1951 M. G. TOWNSLEY ETAL 7,

RETARDED ACTION ELECTRIC MOTOR CONTROL DEVICE Filed June 29, 1946 3 Sheets-Sheet 2 MMWQW INVENTURE MALEDLM E--T]\X/N5L EY 28 z; \XALLIAM MACK ATTY Jan. 9, 1951 Filed June 29, 1946 3 Sheets-Sheet 5 INVENTURE MALEEILM E. TIJWNEILEY wig J4; WILLIAM MACK BY M? ATTY Patented Jan. 9, 1951 RETARDED ACTION ELECTRIC MOTOR CONTBGL DEVICE Malcolm G. Townsley and William Mack, Park Ridge, Iii., assignors to Bell & Howeli Company, Chicago, lit, a corporation of Illinois Application June 29, 1946, Serial N0. 680,356

12 Claims.

tric motor control device which particularly adapted for use in jointly controlling an electric motor driven motion picture camera and a gun for photographically recording the firing of the gun with reference to a target or objective on which the gun is trained, the retarded action motor control device effecting operation of the camera for an interval after a common manual photographing and firing control has been actuated to non-photographing non-firin position, so that the trajectory of a projectile fired by the gun, taking place after the manual photographin and firing control has been actuated to ncn-photographing non-firing position, is photographically recorded by the camera.

Objects of the invention reside in the provision of a novel, effective and reliable retarded action electric motor control device, which is par= ticularly adapted for the use stated above, which provides for timing of the delayed action without employing escapement means therefor, which provides for convenient adjustment of the interval of the delayed action, which provides for alternate energization of two controlled circuits as for alternately energizing a camera motor and a camera heater, which is capable of compactness and well adapted to be built into an electric motor driven motion picture camera as a unit thereof, and which provides for conveniently rendering the device inoperative or operative to control the motor.

The invention will be better understood. by reference to the accompanying drawing forming a part hereof and in which Figure 1 is a partially sectional side elevational view of a retarded action electric motor control device embodying our invention and taken substantially on the line il of Figure 3;

Figure 2 is a side elevational view of the same in elevation similar to that of Figure l and showing parts in different positions than those in which they are shown in Figure 1;

Figure 3 is an end sectional view taken substantially on the line 3-3 of Figure 1;

Figures 4 and 5 are similar perspective views showing parts in different positions;

Figure 6 is a partial perspective view similar to Figures 4 and 5 with'parts removed;

Figures '7 and 8 are different perspective views of the electric switch controlling cam, hereinafter described, of the embodiment of my invention illustrated in Figures 9 and 19;

Figure 9 is an end sectional view of another embodiment of my invention and taken substantially on the line 9--9 of Figure 10;

Figure 10 is a partial side elevation of the embodiment of and taken on the line Iii-40 of Figure 9; and

Figure 11 is a wiring diagram of the device.

Referring to Figures 1 to 6, l and 2 respectively designate parallel vertical frame plates of the mechanism frame of a motion picture camera, and a bracket 3 is disposed between these frame plates and is secured on the frame plate 2 as designated at This bracket is provided with horizontally spaced parallel bracket portions 5 and B disposed normal to the frame plates l and 2, and a horizontal sleeve '2 of non-magnetic metal ex,- tends across between and through the bracket portions 5 and 6 and is secured therewith as shown in Figure 1. A solenoid 8, carried on a bored spool it of insulating material, is fixed between the bracket portions 5 and 6 and surrounds the sleeve 1.

A shaft, generally designated at 9, extends through the sleeve '5 and is mounted therein for rotation and axial shifting movement. As shown, the shaft extends outwardly from both ends of this sleeve and the solenoid 8, the solenoid thus surrounding the intermediate portion of the shaft. Also as shown, this shaft consists of three axial portions, 1. e., a middle portion H and opposite end portions l2 and 13 secured with the middle portion as respectively designated at I 4 and E5. The end shaft portion i2, which is at the left in Figure 1, is of non-magnetic material, while the middle shaft portion H or the middle shaft portion and the end shaft portion i3 is or are of magnetic material, say Norway iron, so that a portion of the shaft forms an armature for the solenoid for axially actuating the shaft, i. e., to the left in Figure 1, upon energization of the solenoid.

An axially bored cam member l6, have large and small bore portions respectively designated at IT and i8, is disposed coaxially of the shaft 9 in the region of the shaft end portion. l3 and the shaft projects through the bore of the cam member. The cam member is rotatably mounted by means of the outer end portion of the large bore portion l1 rotatably engaging on a flange E9 of the sleeve '5, of the small bore portion i8 rotatably engaging on the shaft end portion l3 immediately outward of a flange 2| on this shaft end portion, and of a bored portion 22 of the frame plate 2 in Which the reduced outer end of the cam member is rotatably engaged, the cam member being axially confined between the bracket portion 5 and the bearin portion 22 and the shaft 9 being axially shiftable relative to the cam member.

7 3 A helical sprin 23 is disposed within the enlarged bore portion H of the cam member i6 between the fianges'ls and 2! and surrounds the shaft 9, and this spring has one end 24 bent,

axially and engaged in a radial slot 25 of the flange it of the sleeve 1 to ang ularly fix this end of the spring with this sleeve, see Figures 1 and 6:, and has its other end 26 bent axially and en gag'ed in a radial slot 2'! of the flange 28 to angularly fix this end of the spring with the shaft 9 as shown in Figure 6, the slot Ziforming-aoontinuation of a keyway 28 in the shaft end portion Hi.

The spring 23 is torsionally operative between the sleeve 1 and the shaft-'Hto yieldably rotate,

this shaft in the counter-clockwise direction in Figures 3 to 6 inclusive and? as indicated'by the arrows 29 in Figure 5, and is compressionally operative between the flanges I9 and 2! to axially actuate the shaft 9 in the direction, i. e., to the in Figure 1, oppositethat in which this shaft is actuated by the solenoid 8 upon-energization of the solenoid. A stud 3|" extends radially through thelwall of the cam member 56 adjacent the outer end thereof andbeing s ecured with thecarnmember, is-slidably engaged in the keyway 28 of; the shaft 9 toprovide a drive connection operative to angularly'fix the cam memher and shaft and to permit axial movement of the shaft relative to the cam member, see Figures 3 and 4, thespring 2'3, by reason of the cam member being angularly fixed with the shaft, being also t'ors'ionally operative on the cam member toyieldably rotate it in the direction of the'arrows 29 in Figure The stud 3t extends r'adially'outward from the cam member to form a stopwhich'cooperates with a stop lug 32 on the bearing portion 22' to limit angular movement of the cam member in the direction in which the, shaft 9 and with it the cam member is urged by the spring 23 The stud 3i and stop rugs; may also'limit. angular movement of the cammember and'shaft in, the opposite direction, but this is not essential for the functioning of the devic I A double throw single pole snap action electi icswitc'h, generally designated at '33, is mounted on'th'e frame-plate 2 below the camj member 16, see Figures 1 and 2', and, comprises asfollows: A" base block 3 5. of insulating material is secured onth'e frame plate'i, and two vertically spacedbpposing stationary contacts 35 and 35 aremountedon the b'aseblock. A movable contact. 3 1 is disposed between the contacts 35 and Stand; is mounted onthe freeend of a horizontal resilient metal blade 381' which has its other end secured'on the base block, the movable contact being movable vertically by reason of; there'- sniencetr the blade 33 andbeing thus alternately engageablewith the contacts. 35 "and 36 to al.- ternately close two circuits respectively including the blade 38and contacts 35and Hand the blade 38 and contacts 36 and 31.

A- horizontal spring blade39 has one end thereofsecured with-the base block 3%, and extends iii-correspondence withthe blade 38, corresponding ends of the blades 38 and 39 being secured on the. base block as generally designatedat 41. A 0 sprin 42 has its ends respectively engaged with free portions of the blades 38;- and 39- at pointsspaced longitudinally of these blades, as respectively designated at QS-and t l, andis compressedbetween these blades. The freeend'of the blade 39. is movable-to positions above; and below the blade 38 as respectively shownrin Fig:-

ures 1 and 2. In these positions of the blade 39, the spring 62 assumes opposite over center relation with the blades 38 and 39 so that, when the blade 39 is in its upper position as shown in Figure 1, the spring G2 positions the blade 38 in its lower position with the contacts 36 and 31 contacting, and when the blade 39 15111 its lower position as shown in Figure 2, the spring 42 positions the blade 38 in its upper position with the contacts 35 and 3'! contacting. The blade 39 is relatively strong: and is biased to assume its upper position and to thus normally maintain the contacts 36 and 3? contacting. The sprin 42 in itscooperation with the blades 38 and 39 constitutes the snap action of the switch which results in contact between the contact 31 and the contacts; 35 and sfi being made and broken with desirable quickness.

A vertical stud 45 is mounted on the base block 34 for vertical movement and bears downwardly on the intermediate portion of the blade 39; so'that downward movement of thi's st'ud effect's'downwardmovement of this blade to' c'ause the contact 3l' to move upwardly out of; contact with the contact 36- and into contact with the contact 35 as shown in Figure 2 The cam mem ber'ie is provided with a 'radialcam 46 engage able with the upper endof the stud- 45-t0-move it downwardly. This cam is provided with a relatively long dwell portion "575 and a relatively short lift portion 48, as best shown-in EigureZQ. When the dwell portion 4? of the cam op'pos'e's the stud 45, the stud is in its upper position and thecontactsfi and S'T are'in contact "as sho-wn in Figures 1 and 3, and when the liftportion d3 of the cam depresses the stud E5; the contacts 35 and 3 are in contactas'shown inFi'gure 2. Accordingly; angular positioningof the" cam member 15 controls the alternate contacting of the contact 3l with the contacts Bdaridtfi} The relatively long dwell portion d7 ofthe cam effects contacting of the contacts 35 and 31 throughout asubstantial portion ofthe movement of the camincl udng theendof its movement into which is urged by the spring 23 and at which it is stopped-by the-stud 3F engaging the stop-lug 32" as shown in l iguresll 3 and 4, and the" lift portion 48 0f the cam effects contacting of the contacts 35- and 37 whenthe cam is at; the" opposite-end of its movement as shown'in Figures 2- and 5, and lift portion la-of the cam being operative to depress thestudf 45 as the cam is rotated clockwiseagainst the influence of the spring 23; as 'indicatedjb'y the? ar rows 5i in Figure 4. Accordingly; the double throw switch including the stationary contacts 35 and 36 and the movable Contact 3'1 is eon: trolled by thecam. cc to alternately close two circuits respectively inol'udingthe blade 33iand the contacts 35 and filandjthe blade 3 8 andthe contacts 36 and 3 with positioning bf" thev cam at the opposite. ends of its movement. I

A disengageable toothed clutch comprises, axially engageable toothed axially bored clutch members 52 and 53 disposedncoaxially ofthe shaft 9 in the regic-nof theend-shaft portionl szg nich is opposite. the end shaftp ortion is which-projects the bore of the cam-member [6, the solenoidtbeing desirably disposed-between the cam member and clutch and surrounding the inter.- mediateportion ofthe shaft. BQt-h'of-these clutch members have their bores engaged onthe end shaft portion l2, and the clutch member 521 is secured. at: the outer end of thelshaft portion H. by means ofapinfi ti extendinggdiametrically assigcss through this clutch member and shaft portion, whereas the clutch member 53 is rotatably and slidably mounted on this shaft portion between the clutch member 52 and the bracket portion 5. The clutch member is axially fixed by means of a circumferential flange 55 on this clutch member being confined between the bracket portion 5 and an extension 55 of this bracket portion which is doubled back on the bracket portion and engages the side of this flange opposite that which is engaged by the bracket portion. Accordingly, axial shifting movement of the shaft 9 engages and disengages the clutch members 52 and 53, shifting of the shaft to the right in Figures 1, 2, 4 and 5, under the influence of the spring 23 effecting engagement of the clutch members and shifting of the shaft to the left under the influence of the solenoid 8 when energized effecting disengagement of the clutch members as shown in Figure 5.

In addition to the end shaft portion l2 being of non-magnetic material, the clutch member 52 and the pin 54- are of non-magnetic material so they do not interfere with the actuation of the shaft 9 by energization of the solenoid 8. The spring 23 is also of non-magnetic material so that it is not distorted and its functioning interfered with when this solenoid is energized, and the cam member it is also of non-magnetic material so that this solenoid when energized does not interfere with rotation of the cam member by the spring.

The clutch member 53 is driven from the shaft 51 of an electric motor which is shown diagrammatically in Figure 11 and which is controlled by the device, through the medium of a reduction gear train generally designated at 59, see Figures 1, 2, 4 and 5, and which includes a spiral gear 5! formed on this clutch member and a worm gear 62 meshing therewith, the motor being utilized say for drivin a motion picture camera. The motor drives the clutch member 53 in the direction opposite that in which the shaft 9 is urged. by the spring 23, i. e., in the direction of the arrows 5! in Figure 4, so that when the motor is energized and the clutch members are engaged by the spring as shown in Figures 1, 2 and 4, the shaft and cam member it are rotated in the direction to cause depression of the stud 45 by the cam t6 and consequent contact of the contacts 35 3? as shown in Figures 2 and 5, subsequent disengagement of the clutch members by energizaticn of the solenoid 8 causing the spring to oppositely rotate the shaft and cam member, i. e., in the direction of the arrows 29 in Figure 5, cause elevation of the stud and consequent contact of the contacts 36 and 3'. as shown in Figures 1, 3 and 4.

Referring to Figure 11, an electric current source 63, such as an accumulator battery, has a conductor 5d connecting one pole thereof with one terminal of a current supply switch 65, and a conductor 66 is connected with the other terminal of this switch and divides into branch conductors 6'! and 63 of which the conductor 57 is connected to one terminal as of a conventional multi-terminal connector 5!, and of which the conductor to is connected with one terminal of a primary control switch '52. A conductor 13 is connected with the other terminal of the switch 12 and with a second terminal a l of the connector H, and a conductor 15 is connected with the terminal M and divides into branch conductors l5 and H of which the conductor 16 is connected by branch conductors 78 and 19 with one 6 terminal of the solenoid 8 and with one station ary contact 81 of a manually actuated single pole double throw switch 82, and of which the conductor H is connected with one terminal of a second solenoid 83.

A conductor Ed is connected with the terminal 69 of the connector H and divides into branch conductors 35 and 86 of which the conductor is connected with the blade 38 carrying the movable contact 37 of the switch 33. hereinabove described, and of which the conductor 88 is connected with one stationary contact Bl of a manually actuated single pole double throw switch 88. A conductor 89 connects the other stationary contact 9| of the switch 38 with the stationary contact 35 of the switch 33, and a conductor 92 connects the movable contact member 93 of the switch 38 with one terminal of an electric heater 94, such as is associated with a motion picture camera driven by the motor 58 for heating the camera to insure proper operation of the camera at low temperatures. A conductor 95 connects the stationary contact 35 of the switch 33 with the second stationary contact 55 of the switch 82, and a conductor 9'1 connects the movable contact member 98 of the switch 82 with one terminal of the motor 58. A conductor Q9 connects the other pole of the current source E3 with a third terminal ill! of the connector ii, and a conductor M32 is connected with the ter' minal l6! and divides into branch conductors Hi3, lllil, I65 and me which are connected respectively with the other terminals of the motor 58, the solenoid 8, the heater 9d and the solenoid 83. Conductors i0? and 568 are respectively connected with the conductors l3 and 95 so that the primary control switch 12 controls the energization of another circuit, not shown further, of which this switch and the conductors i6! and H28 form a part, this switch being thus operative to control, jointly with the control by this switch of the motor 58, the heater Q i the solenoid t3 as hereinafter explained, the operation of an additional instrumentality such as a gun of the automatic type.

Assuming the current supply switch 62: to be in closed position, the primary control switch '12, being included in the circuits of the solenoids 8 and 83 and the circuit of which the conductors is? and I556 form a part, is operative to simultaneously energize and deenergize these cn'cuits, and assuming the movable contact 98 of the switch 82 to be in contact with the stationary contact 96 and the movable contact 1 53 of the switch 88 to be in contact with the stationary contact 9!, the stationary contact 38 and the movable contact 31 of the switch 33 are in series with the motor 58, and the stationary contact 35 and the movable contact 31 of the switch 33 in series with the heater 9Q, so that the switch 33 "a in alternately energizes the motor and in opposite positions of the movable contact Assuming the switches 65, 82 and to be in the positions just described, the operation of the device is as follows:

The condition of the device upon the completion of a cycle thereof resulting from closing and opening the primary control switch 12 preparatory to a succeeding cycle resulting from again closing and opening this switch is illustrated in Figure 2. This condition comprises the cam angularly fixed with the shaft 9 and clutch mo. ber 52 as hereinabove described, being an ularly positioned at the end of its movement opposite that into which it is urged by the spring 23 and '7 at which itis'stopp'edby the stud 3| engagin the stop lug'32 the lift portion 58 of the. cam 46- in this opp'osite-end position of the cam member depressing'the stud 45 and thus positioning the movable contact 31 of the switch 33 in contact with the stationary contact 35 and out of contact with the stationary contact 35', and the cam member being held in this position by reason of the clutch members 52' and 53 being held in engagement by the spring 23 and the clutch mem'- ber 53 being held against'rotation as by the spiral gear '61 meshing with the worm gear 62, it being observedthat the solenoid 8 is now 'deenergized by reasonof the primary control switch '52 being open, that the motor is now not energized by reason of the movable contact 3? of the switch 33 being out of contact with the stationary contact 3'6, and' that the heater 96 is now energized by reason of the movable contact 33 of the switch 33 being in contact with the stationary contact 35.

Closure of the primary control switch 12 energizes the solenoid 8 resulting in axial movement of the shaft 9 against the influence of the spring 23: and consequent disengagement of the clutch members 52 and 53 as shown in Figure 5. The disengagement of these clutch members permits the spring 23 to actuate the earn it from the said opposite end position thereof, in which position the cam is shown in Figures 2 and 5, and the direction of the arrows 28 in Figure and to the end of its movement into which it is urged this spring and stopped by the stud 3i engaging thestop lug 32 as shown in Figures 3 and i. In this latter position of the cam 36, the dwell portion 4? of the cam opposes the stud t5 and permi-ts it to assume its upper position with the result that the movable contact til or the switch 33 is positioned in contact with the stationary con- 7 tact 36 and out of contact with the stationary contact -35-as shown in Figures 1, 3 and 11, it being. observed that the solenoid 8 is now energized by reason oi the primary control switch 12 being closed, that the motor 58 is now energized by reason "of the movable contact 3 of the switch 33 being in contact with the stationary contact 33,

and that theheater 9 is now deenergized by reason of the movable contact 3? of the switch 33 being out of contact with the stationary contact 35.

This latter condition continues as long as the 5m primary control switch '52 remains closed and maybe termed the normal running condition the interval of which is variable at will, a motion picture camera driven by the motor 58 continuing to run and an additional instrumentality, a

such'as a gun of the automatic type, controlled by the switch 12, by reason of this switch being in series with the conductors H5! and IE8, also con" tinuing to operate as long as the switch '52 remains closed, it being observed that the clutch members 52 and 53 are disengaged as long as the switch 12 remains closed so that the clutch meniber 53, which is driven from the motor,v rotates free of theishait 9.

Opening of the primary control switch 52 terminates the operation of the aforesaid additional instrumentality or gun controlled by this switch andral'so causes deeneigization of the solenoid 8 and consequent engagement of the clutch im'embers-"E2 a nd53 by axialactuation oi the shaft 9 and clutch member 52 by the spring '23, thus terminating the normal running condition and initiating what may be termed the overrunn'ing condition throughout which themcto'r 53 eontin'ues to run though the 'swi tch 224s open, the

8 condition of the device at the initiationof the overrunnin'g condition being shown in Figures 1 an-d4.

At the initiation of the overrunning condition, the-cam #6 is positioned at the end of its movement into which it is yieldably urged by the spring and at which it is stopped by engagement of the-stud 3| with the stop lug 32, and in this position of the cammember the dwell portion-d-l of the cam 26 opposes the stud 55 so that the contacts 31 and 36 of the switch are in contact, which results in the motor 58 continuing to be energized after the clutch members 52 and 53 are engaged.

As the motor continues to be energized, it rotates the shaft 9 and cam 53- through the gear train 59 and the engaged clutch members 52 and 53 in the direction of the arrows 51 in Figure 4 from the end of the movement of the cam member into which it is urged by the spring .23 and at which it is stopped by the stud 3 lengaging the stoning 32 to the opposite end of its movement.

Recalling that the dwell portion t? of the cam 25- eiiects contacting of the contacts 38 and 37 of the switch 38 and consequent energization of themotor 53' throughout a substantial portion of the movement of the cam including the end of its movement into which it is urged by the spring 2a and at which it is stopped by the stud 31 engthe stop-lug the motor continues to be energized throughout a commensurate overrun interval while the motor is rotating the cam it toward the end of its movement opposite that into which it is yieldably urged by the spring and at which it is stopped by the stud 3i engaging the stop lug 32. When the cam 48, while still being rotated by the motonapproaches the said opposite end of. its movement, the lift portion at of the cam depresses the stud 55 until the contact 3"! or" the switch 33 is actuated out oi contact with the stationary contact 38 and into contact wtih the stationary contact 35,whereupon thecverrunning condition ceases, the motor be ing deenergized and the heater being energized, it b ing noted that thesolenoid' 2 had been previously deenergized upon the opening of the switch i2attheinitiation of the overrunning'condit'ion. This completes the cycle of the device whichv is then inthe condition illustrated in Frigure 2 and her-einbeiore described.

Referring to Figure 11, the overrun operation of the device may be 'omittedby placing the movaolcontact $8 of the switch *82 out of contact with the stationary contact 85 and into contact with the stationary contact 8 which places the "primary control switchiil inseries with the motor 5'8 sothat the motor is directly controlled by the latter switch, it being observed that under this condition the soienoidfi is still in-ser-ieswith the switch- ?2 so that the clutchrnembers '52 and 53 are disengaged while the motor is energized.

Energization of the heater 94 may be'made independent of the switch 33 and subject only to control by the current sup-ply switch 65 -by placing the movable contact 93 of the switch S8- out'of contact with the stationary contact 91 and in cont-act with the stationary contact 57, and may 3e discontinued by placing'th'e movablecontact teof the switch 88 in an intermediate position out of "contact 'with both of the stationary contacts t? and 91. x

The solenoid 83 is intended for an overrun in dic'a'ing device, unnecessary to be described, and bang in series with the primary control switch 1-2; is alternately energized and deenergized-with closing and opening of this switch for the said purpose.

Figures '7 to 10 inclusive illustrate another embodiment of our invention which differs from that of Figures 1 to 6' inclusive in that, whereas in the embodiment of Figures 1 to 6 the stop means, consisting of the stud 3! and stop lug 32, which stop the cam member 15 and its cam 46 at the end of their movement into which they are yieldably urged by the spring 23, is not adjustable so that the overrun interval is fixed disregarding different speeds of the motor 58, in the embodiment of Figures 7 to 10 inclusive an equivalent stop means is provided which is adjustable to vary the position of the cam member It and its cam 45 when stopped thereby, so that the overrun interval may be varied at will, some slight structural changes being also involved in the latter embodiment and the wiring diagram of Figure 11 being applicable to both embodiments. Inasmuch as many of the parts of the embodiment of Figures 7 to 10 inclusive are identical with the equivalent parts of the embodiment of Figures 1 to 6, the same reference characters are applied thereto.

Referring to Figures '7 to 10 inclusive, the cam member I6 is coaxial with and surrounds the shaft 9 in the region of the end portion l3 of the shaft and the spring 23, disposed within the enlarged bore portion ll of the cam member l and having its outer end 25 bent axially and engaged in the radial slot 21 of the flange 2! of the end shaft portion I3, is torsionally operative to actuate the shaft 9 in the counterclockwise direction in Figure 9, which direction is opposite that in which the shaft is rotated from the motor 58 through the clutch members 52 and 53, and the spring is compressi-onally operative on the flange 2! to axially actuate the shaft 9 to the left in Figure to engage the clutch members 52 and 53 which direction is opposite that in which the shaft is actuated by the solenoid 3 when energized to disengage the clutch members, all the same as is the case with the embodiment of Figures l. to 6.

The driving connection between the shaft 9 and the cam member 6 is different in that it comprises an axial slot liii through the wall of the cam member is and a stud i012 extending radia ly into the flange 2! of the end shaft portion 53 and secured therein and slidably'engaging the slot ill! to angularly fix the shaft and cam member and to permit axial movement of the shaft relative to the cam member, the spring 23 being also torsionally operative on the cam member, by reason of the stud I32 engaging the slot lot, to yieldably rotate the cam member counterclockwise in Figure 9, and the cam member being provided as before with the cam 5-5 which is provided with the relatively long dwell portion t! and the relatively short lift portion 48.

lhe cam member 5 5 is provided with a stop formation, generally designated at I83, which consists of a plurality of stop elements stepped angularly and axially of the movement of the cam member as respectively designated at we, Illii, ice, it? and N58, and a stop lever I59, intermediately pivoted as designated at l l l' on an axis disposed transversely to that of the cam member, has at its upper end a stop lug H2 which is adjustable axially of the cam member with pivotal adjustment of the lever to be selectively engaged by the stop elements N14 to I63 inclusive for varying the position of the cam member l6 and its cam 46 at which it is stopped by the stop means comprising the stop elements I04 to H38 inclusive and the stop lever 09. A spring latch member I it has one end portion secured on the frame plate 2 as designated at H 1, and the other portion of this latch member overlie the lower end portion of the lever IE5 and is provided with an arcuate notched slot [5 having its axis coincident with the pivotal axis of the lever. A part spherical cam latch element 5 i6 is formed on the lower portion of the lever itlil and has selective camming engagement with the notches of the slot H5 to releasably maintain the lever I09 in its several adjusted position for positioning the stop lug l 52 for selective engagement thereof by the stop elements [94 to M8 inclusive.

The stop means, comprising the stop elements Hi l to H38 inclusive and the stop lever H19, functions in the same manner as does the stop means comprising the stud 3i and stop lug 32 of Figures 1 to 6 inclusive and so limits movement of the cam 45 in the direction which it is urged by the spring 23, but is adjustable to vary the position of the cam 46 when stopped thereby.

The cam 46 of Figures 7 to 10 inclusive controls the switch 33 in the same manner as it does in Figures 1 to 6 inclusive, hereinabove described. Recalling that when the cam 56 is at the end of its movement into which it is urged by the spring 23 and at which it is stopped by the stop means, the dwell portion 41 of the cam opposes the stud at, with the result that the contacts 36 and 31 of the switch 33 are in contact and the motor 58 is energized, adjustment of the stop means of Figures 7 to 10 inclusive, to vary the position at which the cam 46, as urged by the spring 23, is

stopped by the stop means, results in a greater or less extent of the dwell portion 4'! of the cam traversing the stud 45 during the overrun condition when the motor 58 is rotating the cam to the opposite end of its movement where the lift portion as of the cam depresses the stud 45 to deenergize the motor and terminate the overrun condition, as shown in Figures 9 and 10 which illustrate the same condition as is i lustrated in Figure 2 hereinabove described. Consequently, the adjustable stop means of Figures '7 to 10 inclusive provides for variation of the overrun interval at will by adjustment of the stop lever 19.

While we have thus described our invention, we do not wish to be limited to the precise details described, as changes may be readily made without departing from the spirit of our invention, but having thus described our invention, we claim as new and desire to secure by Letters Patent the following:

1. Ina device of the character described, the combination of an electric motor, an electric switch controlling the energizatf on of said motor, a movable switch controlling member yieldably urged in one direction, stop means operative to limit movement of said switch controlling memher in its yieldably urged direction, said switch controlling member being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement into which it is yieldably urged and to position said switch in motor deenergizing position when it is at the opposite end of its movement, a drive connection comprising a disengageable clutch between said motor and switch controlling member and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in' motor deenergizing' position and to maintain while said clutch is engaged said switch COl'ltlOlling member at said opposite end of its movement, said clutch when disengaged permitting actuation of said switch controlling member under'its yieldable urge to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position, and manually controlled means for disengaging said clutch for chosen intervals and reengaging the same.

2. In a device of the character described, the combination of an electric motor, an electric switch controlling the energization of said motor, a movable switch controlling member yieldably urged in one direction, stop means operative to limit movement of said switch controlling memher in its yieldably urged direction, said switch controlling member being operative to position tive when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in motor deenergizing. position and to maintain while said clutch is engaged said switch controlling member at said opposite end of its movement, said clutch being yieldably urged into engagement and when disengaged permitting actuation of said switch controlling member under its yieldable urge to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position, an electromagnetic device operative when energized to disengage said clutch, and a manually controlled second electric Switch for energizing said. electromagnetic device for chosen intervals and deenergizing the same.

3. In a device of the character described, the combination of an electric motor, an electric switch controlling the energization of said motor, an angularly movable switch controlling member, stop means operative to limit movement of said switch controlling member in one direction, said switch controlling member being operative to position said switch in motor energizing position throughout as substantial portion of its movement including the end of its movement at which it is stopped by said stop means and to position said switch in motor deenergizing position when it is at the opposite end of its movement, a drive connection comprising a dis-engageable clutch between said motor and switch controlling member and operative when said clutch is engaged and said motor is energized under the control of said switch to cause saidmotor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is engaged said switch controlling member at said opposite end of its movement, said clutch when disengaged permitting actuation of said switch controlling member to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position and said clutch Comprising axially engagea-bIe clutch members disposed coaxially of said switch controlling memher and one of which is axially shiftable to engage and disengage said clutch members, a helical spring disposed coaxially of said switch controlling member and torsionally operative on said switch controlling member to actuate the same to said first mentioned end of its movement when said clutch is disengaged and compressionally operative on said axially shiftable clutch member to engage said clutch members, and manually controlled means for disengaging'said clutch for chosen intervals and reengaging the same.

4. In a device of the character described, the combination of an electric motor, an electric switch controlling the energization of said motor, a rotatable and axially shiftable shaft, an angularly movable switch controlling member disposed coaxially of said shaft, a driving connection operative to angularly fix said switch controlling member and shaft, stop means operative to limit movement of said switch controlling member in one direction, said switch controlling member being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement at which it is stopped by said stop means and to position said switch in motor deenergizing position when it is at the opposite end of its movement, a drive connection comprising a disengageable clutch between said motor and said shaft and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is engaged said switch controlling member at said opposite end of its movement, said clutch when disengaged permitting actuating of said switch controlling member to said first mentioned end'of its movement with consequent positioning of said switch in motor energizing position and said clutch comprising axially engageable clutch members disposed coaxially of said shaft and one of which is fixed on said shaft for, axial shifting movement therewith to engage and disengage said clutch members, spring means operative to actuate said switch controlling member to said first mentioned end of its movement when said clutch is disengaged and operative to axially actuate said one clutch member and shaft to engage said clutch, an electromagnetic device operative when energized to disengage said clutch, and a manually controlled second el ctric switch for energizing said electromagnetic device for chosen intervals and deenergizing the same.

5. In a device of the character described, the combination of an electric motor, an electric switch controlling the energization of said motor, a rotatable and axially shiftable shaft, an angularly movable switch controlling member disposed coaxially of said shaft in the region of one end thereof, a driving connection operative to angularly fix said switch controlling member and shaft, stop means operative to limit movement of said switch controlling member in one direction, said switch controlling member being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end or its move-.. ment at which it is stopped by said Stop means and to position said switch in motor deenergizing p sition when it is at the opposite end of its movement, a drive connection comprising a disengageable clutch between said motor and said shaft and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is engaged said switch controlling member at said opposite end of its movement, said clutch when disengaged permitting actuation of said switch controlling member to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position and said clutch comprising axially engageable clutch members disposed coaxially of said shaft in the region of the other end thereof and one or which is fixed on said shaft for axial shifting movement therewith to engage and disengage said clutch members, spring means operative to actuate said switch controlling member to said first mentioned end of its movement when said clutch is disengaged and operative to actuate said one clutch member and said shaft to engage said clutch members, an electromagnetic device operative when energized to disengage said clutch and comprising a solenoid surrounding the inter mediate portion of said shaft and a portion oi said shaft being of magnetic material and forming an armature for said solenoid, and a manually controlled second electric switch for energizing said solenoid for chosen intervals and deenergizing the same.

6. In a device of the character described, the combination of an electric motor, an ele tric switch controlling the energization of said motor, a rotatable and axially shiitable shaft, an angularly movable axially bored switch controlling member disposed coaxially of said shaft in the region of one end thereof and into the bore of which said shaft projects, a driving connection operative to angularly fix said switch controlling member and shaft and to permit axial movement of said shaft relative to said switch controlling member, stop means operative to limit movement of said switch controlling member in one direction, said switch controlling member be ing operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement at which it is stopped by said step means and to position said switch in motor deenergizing position when it is at the opposite end of its movement, drive connection comprising a disengageable clutch between said motor and said shaft and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said switch controlling member to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is engaged said switch controlling member at said opposite end of its movement, said clutch when disengaged permitting actuation of said switch controlling member to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position and said clutch comprising axially engageable clutch members disposed co axially of said shaft in the region of the other end thereof and one of which is fixed on said shaft for axial shifting movement therewith to engage and disengage said clutch members, a helical spring disposed within the bore of said switch controlling member and surrounding said shaft and torsionally operative on said switch controlling member to actuate the same to said. first mentioned end of its movement when said? clutch is disengaged and compressionally operative on said shaft to engage said clutch members, an electromagnetic device operative when.

energized to disengage said clutch and comprising a solenoid surrounding the intermediate por-- tion of said shaft and a portion of said shaft being of magnetic material and forming an armature for said solenoid, and a manually controlled. second electric switch for energizing said solenoid for chosen intervals and deenergizing the same.

7. In a device of the character described, the combination of an electric motor, a snap action electric switch controlling the energization of said motor and yieldablv urged into one of its circuit controlling positions, an angularly movable cam yieldably urged in one direction, stop means operative to limit movement of said cam in its yieldably urged direction, said cam being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement into which it is yieldably urged and to position said switch in motor deenergizing position when it is. at the opposite end or" its movement, a drive connection comprising a disengageable clutch between said motor and said cam and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said cam to said opposite end or its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is engaged said cam at sa d opposite end of its movement, said clutch when disengaged permitting actuation of said cam under its yieldable urge to said first ment oned end of its movement with consequent positioning of said switch in motor energizing position, and manually controlled means for disengagi'g said clutch for chosen intervals and reengaging the same.

8. In a device of character described, the combination. of an electric motor, a snap action electric switch controlling the energization of said motor and yieldahly urged into one of its circuit controlling positions, on angularly movable cam yieldably urged in one direction, stop means operative to limit movement of said cam in its yieldably urged direction, said cam being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement into which it is yieldaoly urged and to position said switch in motor deenergizing position when it is at the opposite end of its movement, a driving connection comprising a disengageable toothed clutch between said motor and said cam and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said cam to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutch is en aged said cam at said opposite end of its movement, said clutch being yieldably urged into engagement and when disengaged permitting actuation of said cam under its yieldable urge to said first mentioned end of its movement with consequent positioning :of said switch in motor energizingposition, an electromagnetic device operative when energized to dis engage said c1utch,.and a manually controlled second electric switch for energizing said electromagnetic evice for chosen intervals and deenergizing the'same.

'9. In a device of the character described-the combination of an electric motor, a snap action electric switch controlling the energization of said motor and yieldably urged into one of its circuit controlling positions, a rotatable and axially shiftable shaft, an angularly movable cam disposed coaxially of said shaft, a driving connecticn operative to angularly fix said cam and shaft, stop means operative to limit movement of said cam in one direction, said cam being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement at which it is stopped by said stop means and to position said switch in motor deenergizing position when it is at the opposite end'of its movement, a drive connection comprising a disengageable clutch between said motor and said shaft and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate saidcam to said opposite end of its movement with consequent positioning of said switch in motor deene gizing position and to maintain while said clutch is engaged said cam at said opposite end of its movement, said clutch when disengaged permitting actuation of said cam to said first mentioned end of it movement with consequent positioning of said switch in motor energizing position and said clutch comprising axially engagea-ble clutch members disposed coaxially of said shaft and one of which is fixed on said shaft for axial shifting movement therewith to engage and disengage said clutchmembers,spring means operative to actuate said cam to said first mentionedend of its movement when said clutch is disengaged and operative to actuate said one clutch member and shaft to engage said clutch, an electromagnetic device operative when energized to disengage said clutch, and a manually controlled second electric switch for energizing said electromagnetic device for chosen intervals and deenergizing the same.

10. In a device of the character described, the combination of an electric motor, a snap action electric switch controlling the energization of said motor and yieldably urged into one of its circuit controlling positions, a rotatable axially 'shiftable shaft, an angularly movable axially bored cam disposed coaxially of said shaft in the region of one end thereof and into the bore of which said shaft projects, a driving connection operative to angular-1y fix said cam and shaft and to permit axial movement of said shaft relative to said cam, stop means operative to limit movement of said cam in one direction, said cam being operative to position said switch in motor energizing position throughout a substantial portion of its movement including the end of its movement at which it .is stopped by said stop means and to positionzsaid switch in motor i6 deenergizing position when it is at the opposi-te end of its movement, a drive connection comprising a disengageable toothed clutch between said motor and said shaft and operative when said clutch is engaged and said motor is energized under the control of said switch to cause said motor to actuate said cam to said opposite end of its movement with consequent positioning of said switch in motor deenergizing position and to maintain while said clutchis engaged said cam at said opposite end of its movement, said clutch when disengaged permitting actuation of said cam to said first mentioned end of its movement with consequent positioning of said switch in motor energizing position and said clutch comprising axially engageable toothed clutch members disposed coaxially of said shaft and one of which is fixed on said shaft for axial shifting movement therewith to engage and disengage said clutch members, a helical spring disposed within the bore of said cam and surrounding said shaft and torsionally operative :on said cam to actuate the same to said firstmenvtioned end of its movement when said clutch is disengaged and compressionally operative on said shaft to engage said clutch members, an electromagnetic device operative when energized to disengagesaid clutch and comprising a solenoid surrounding the intermediate portion of said shaft and a portionof said shaft being-of magnetic material and forming an armature for said solenoid, and a manually controlled secondelectrio switch for energizing'said solenoid for chosen intervals and'deenergizing the same. 1

11. In a device of the character described, the combination as set forth in claim 1 and further characterized in that said stop means comprises a plurality of said stop elements stepped lineally and transversely of the movement of said switch controlling member and a cooperating stop element adjustable transversely of said movement to be selectively engaged by said stepped stop elements for varying the position of said switch controlling member when stopped by said stop means.

12. In a device of the character described, the combination as set forth in claim '7 and further characterized in that said stop means comprises a plurality of stop elements on and stepped angularly and axially of said cam and a cooperating stop element adjustable axially of said cam to be selectively engaged by said stepped stop elements for varying the position of said cam when stopped by said stop means.

MALCOLM G. TOW N SLEY. W'ILLIAM MACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PAENTS Number Name Date 1,863 645 Baumann et al. June 21, 1932 2,248,350 Hill July -8, 1941 2,285,415 Collins June 9, 19.42 2,290,626 Bosomworth July .21, 1942 

